//===- llvm/ADT/SetVector.h - Set with insert order iteration ---*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Reid Spencer and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
-// This file implements a set that has insertion order iteration
+// This file implements a set that has insertion order iteration
// characteristics. This is useful for keeping a set of things that need to be
// visited later but in a deterministic order (insertion order). The interface
// is purposefully minimal.
//
+// This file defines SetVector and SmallSetVector, which performs no allocations
+// if the SetVector has less than a certain number of elements.
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_SETVECTOR_H
#define LLVM_ADT_SETVECTOR_H
-#include <set>
-#include <vector>
-#include <cassert>
+#include "llvm/ADT/SmallSet.h"
#include <algorithm>
+#include <cassert>
+#include <vector>
namespace llvm {
-/// This class provides a way to keep a set of things that also has the
+/// This adapter class provides a way to keep a set of things that also has the
/// property of a deterministic iteration order. The order of iteration is the
/// order of insertion.
/// @brief A vector that has set insertion semantics.
-template <typename T>
+template <typename T, typename Vector = std::vector<T>,
+ typename Set = SmallSet<T, 16> >
class SetVector {
public:
typedef T value_type;
typedef T key_type;
typedef T& reference;
typedef const T& const_reference;
- typedef std::set<value_type> set_type;
- typedef std::vector<value_type> vector_type;
- typedef typename vector_type::iterator iterator;
+ typedef Set set_type;
+ typedef Vector vector_type;
+ typedef typename vector_type::const_iterator iterator;
typedef typename vector_type::const_iterator const_iterator;
typedef typename vector_type::size_type size_type;
/// @returns true iff the element was inserted into the SetVector.
/// @brief Insert a new element into the SetVector.
bool insert(const value_type &X) {
- bool result = set_.insert(X).second;
+ bool result = set_.insert(X);
if (result)
vector_.push_back(X);
return result;
template<typename It>
void insert(It Start, It End) {
for (; Start != End; ++Start)
- if (set_.insert(*Start).second)
+ if (set_.insert(*Start))
vector_.push_back(*Start);
}
/// @brief Remove an item from the set vector.
- void remove(const value_type& X) {
- if (0 < set_.erase(X)) {
- iterator I = find(vector_.begin(),vector_.end(),X);
- if (I != vector_.end())
- vector_.erase(I);
+ bool remove(const value_type& X) {
+ if (set_.erase(X)) {
+ typename vector_type::iterator I =
+ std::find(vector_.begin(), vector_.end(), X);
+ assert(I != vector_.end() && "Corrupted SetVector instances!");
+ vector_.erase(I);
+ return true;
}
+ return false;
}
vector_.pop_back();
}
+ bool operator==(const SetVector &that) const {
+ return vector_ == that.vector_;
+ }
+
+ bool operator!=(const SetVector &that) const {
+ return vector_ != that.vector_;
+ }
+
private:
set_type set_; ///< The set.
vector_type vector_; ///< The vector.
};
+/// SmallSetVector - A SetVector that performs no allocations if smaller than
+/// a certain size.
+template <typename T, unsigned N>
+class SmallSetVector : public SetVector<T, SmallVector<T, N>, SmallSet<T, N> > {
+public:
+ SmallSetVector() {}
+
+ /// @brief Initialize a SmallSetVector with a range of elements
+ template<typename It>
+ SmallSetVector(It Start, It End) {
+ this->insert(Start, End);
+ }
+};
+
} // End llvm namespace
// vim: sw=2 ai